福建农业学报2016，Vol.31Issue(3)：273-279,7.DOI:10.19303/j.issn.1008-0384.2016.03.012
采样数量和分布模式对土壤有机质空间插值精度的影响
Effect of Sampling Quantity and Distribution on Precision of Spatial Interpolation on Soil Organic Matters
摘要
Abstract
Based on the randomly sampled data collected from the high density soil sampling spots at the agricultural lands in Beijing southern suburban plain of Daxing ,the geographic information system and the spatial interpolation were applied to determine the effect of sampling quantity and distribution on the precision of the interpolation on soil organic matters .The results showed that (1) the appropriate sampling quantity from high to low was included in the tests for precision ,variation function fitting ,normal distribution ,as well as average and variation functions that met the required relative error of less than 5% ;(2) although the imitative effect of variation function gradually increased with increasing sampling number ,495 sampling sets was found to be better than 825 ,while the variation function fitting effect was similar under same sampling distribution ;(3) the precision differed according to the interpolation methods at same sampling set ,BEK was the best for 2 272 ,825 and 115 sampling sets ,while SWT ,SK ,and LPI for 1 485 ,495 and 83 sets ,respectively ;and ,(4) as far as sampling distribution was concerned ,the precision of interpolation model was low when the P value of the nearest neighbor distance was less than 0.05 ,it improved when the P values was greater than 0.05 and the R ratio close to 1 ,and stabilized when the P value was greater than 0.05 and the R ratio greater than 1.20 .关键词
土壤有机质/采样数量/插值模型/分布模式/精度Key words
soil organic matter/sampling quantity/interpolation model/distribution pattern/precision分类
农业科技引用本文复制引用
蒋威,郜允兵,刘玉,潘瑜春,邢世和..采样数量和分布模式对土壤有机质空间插值精度的影响[J].福建农业学报,2016,31(3):273-279,7.基金项目
国家科技支撑计划课题（2013BAJ05B01）；国家自然科学基金项目 （）
